CI SLUICE VALVES



GUIDELINES FOR FACTORY INSPECTION OF CI SLUICE VALVES (IS: 14846:2000)

1. MARKING:

The following information shall be cast on each valve body in raised letters.

a) The manufacturer's name or trade-mark

b) The nominal pressure of valve (PN 1.0 or PN 1.6)

c) Size of valve (mm)

d) Heat number of cast

e) Year of manufacture

In addition each valve shall bear conspicuously upon it prior to despatch;

f) Serial number in punch, on top of flanges and

g) Where a valve has been tested for only openend test, it should be marked '0' distinctly and permanently on flanges adjacent to serial number...

2. NOMINAL PRESSURES :

Sluice valves shall be designated by nominal pressure(PN) defined as the maximum permissible gauge working pressure in MPa for the sizes indicated as follows:

Nominal Pressure (PN)

MPa

Nominal Sizes

mm

PN 1.0

50 to 1 200

PN 1.6

50 to 600

3. Physical Dimensions

Nominal Size, Body, Stem and Stuffing Box, Cap(details copy attached)

Flanges of the Sluice Valve

SNo

Particulars

Dimensions of Nominal size(mm)

 

 

50

65

1

Outside diameter (D)

165 {+1.5,-1}

185 {+1.5,-1.0}

2

Thickness of flange

16.5 {+2.0,-0.0}

16{+2}

3

Diameter of bolt circle (C)

125{+1,-1}

145{+1.-1}

4

Number of bolts (Equally

spaced off centre)

4

4

5

.Diameter of bolt holes (d)

19

19

6

 Diameter of bolts 16 16

16

16

4. Coating:

  • All coatings shall be carried out after satisfactory testing of the valves prior to despatch. All the unmachined ferrous surfaces of the valve (both inside and outside) shall be thoroughly clean, dry and shall be free from rust and grease before painting. All exposed machined ferrous surfaces shall be painted with one coat of aluminium red oxide primer conforming to IS 5660.
  • Twocoats of black japan conforming to TypeB of IS 341 or paint conforming to IS 9862 or IS 2932

              shall be applied by brush or spray for exterior application in colour as approved by the purchaser.

5. Tests to be conducted ob Sluice Valves:

Hydraulic test

  • Closed-end test

Each valve shall be tested with the spindle in vertical position, unless otherwise specified by the purchaser. The testing machine, which may be either of hydraulic or mechanical type, shall exert adequate force to compress the flexible material on either side without exerting an undue load on the valve body.

Each valve held in vertical position shall be subjected to three hydrostatic tests. The first test shall be made with the wedge open and the pressure applied for a period of minimum 5 minutes to the whole body of the valve after releasing air through the gland. The second and third tests shall be made to determine the water tightness of the faces with  the wedge closed. After the first test, the body pressure shall be reduced to working pressure and the wedge shall be closed so that the bonnet remains filled with water. The second test shall be conducted with the pressure applied to the one face and the third test with the pressure applied to the other face of the wedge. Under this condition, the valve seating on the down-stream side shall be watertight for a period of 2 minutes. During the period of above test, the pressure gauge reading shall not fall below the test pressure.

Open end test

Each valve held in vertical position shall be subjected to three separate hydrostatic tests. The first test shall be made when the wedge is open and the pressure applied to whole body of the valve after releasing air through the gland and for this test only use of the testing machine for closed end testing shall be permissible The second and third tests shall be made to determine the water-tightness of the faces with the wedge closed and the valve fixed at one end only.

After the test, the wedge shall be closed so that the bonnet remains filled with water. The second test shall be conducted with the pressure applied to the one face and the third test with the pressure applied to the other face of the wedge. Under this condition, the valve sealing on the down-stream side shall be watertight for a period of 2 minutes. During the period of above test, the pressure gauge reading shall not fall below the test pressure.

Test pressure for Sluice Valve

PN Rating

Test for body/Seat

Test pressure

MPa (Gauge)

PN 1.0

Body

1.5

Seat

1

PN 1.6

Body

2.4

Seat

1.6

Test duration for Sluice Valve

Valve Size (mm)

Test for body/Seat

Test duration

min

50 to 1200

Body

5

Seat

2

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